not too sure but i was on metformin for IR prior to falling pregnant with both DD's. and i kept taking it up until i was 14 weeks.

i wasn't testing bsl's so not sure what my levels would've been. i did go on to have insulin dependant gd with DD1 and although my tests for DD2 said i didn't have gd i think i did as i was monitoring my bsl's throughout her pregnancy and averaged 8-10mmo/L readings for after food and 6-7mmo for fasting.